646928160 has 48 divisors (see below), whose sum is σ = 2037825216. Its totient is φ = 172514048.

The previous prime is 646928141. The next prime is 646928167. The reversal of 646928160 is 61829646.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (646928167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 673404 + ... + 674363.

It is an arithmetic number, because the mean of its divisors is an integer number (42454692).

Almost surely, 2^646928160 is an apocalyptic number.

646928160 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646928160 is an abundant number, since it is smaller than the sum of its proper divisors (1390897056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646928160 is a wasteful number, since it uses less digits than its factorization.

646928160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1347785 (or 1347777 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 646928160 is about 25434.7824838350. The cubic root of 646928160 is about 864.8723613553.

The spelling of 646928160 in words is "six hundred forty-six million, nine hundred twenty-eight thousand, one hundred sixty".